brand new and high quality Feature: The QRM Eliminator is inserted into the feedline the antenna without any additional modifications required to the radio. The box has a built-in PTT control which enables the Eliminator to stay connected during transmit. An additional auxiliary receiving antenna is required, though, like a 2m antenna or simply a couple of meters wire in the shack. The unwanted signal is received with both antennas resulting in different phases. The QRM Eliminator now allows to adjust the phase angle as well as amplification in a way to cancel out the unwanted signal before it reaches the receiver front end! It's based on a totally innovative concept and cannot be compared to the normal 'noise blanker' performance. X-Phase is located in a shack is included in the gaps of the antenna feeder. To the "AUX" jack, connect the AUX antenna, 2 to 5 meters Any wire stretched along the shelf of your shack. The Qrm Eliminator contains interface circuitry necessary for operation with most modern HF transceivers. As can be seen from the circuit diagram, the X-Phase device in transmission mode forms through high-frequency channel between the connectors "MAIN". Maximum The power of the high-frequency signal transmitted through this channel should not be exceed 100 watts! Do not connect the instrument to the PA output under any circumstances! Can be used with civilian radio stations. (CB 27 mHz) Specifications: Material: Metal Dimension: approx.12.5x11cm/4.92x4.33in Color: As pictures shown Quantity: 1 Set Note: No retail package. Please allow 0-1cm error due to manual measurement. pls make sure you do not mind before you bid. Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thank you! Package Includes: 1 Set x QRM Eliminator Kit (other accessories demo in the picture is not included)